1-code.js

return Promise.try(() => {
	let query = gql`
		query SomeDrives($driveNames: [String]) {
			hardware {
				drives(names: $driveNames) {
					path
					model
					size
				}
			}
		}
	`;

	return graphql.graphql(schema, query, root, {}, {
		driveNames: ["sda", "sdb"]
	});
}).then((results) => {
	console.log(util.inspect(results, {colors: true, depth: null}));
});

2-output.js

{ data: 
   { hardware: 
      { drives: 
         [ { path: '/dev/sda',
             model: 'TOSHIBA MD04ACA400',
             size: <Unit> 3.7 TiB },
           { path: '/dev/sdb',
             model: 'WDC WD40EZRX-00SPEB0',
             size: <Unit> 3.7 TiB } ] } } }